Sahih Bukhari Volume 005, Book 057, Hadith Number 057.
Narated By Abu Huraira : The people used to say, "Abu Huraira narrates too many narrations." In fact I used to keep close to Allah's Apostle and was satisfied with what filled my stomach. I ate no leavened bread and dressed no decorated striped clothes, and never did a man or a woman serve me, and I often used to press my belly against gravel because of hunger, and I used to ask a man to recite a Quranic Verse to me although I knew it, so that he would take me to his home and feed me. And the most generous of all the people to the poor was Ja'far bin Abi Talib. He used to take us to his home and offer us what was available therein. He would even offer us an empty folded leather container (of butter) which we would split and lick whatever was in it.